Number of length 4 arrays x(i), i=1..4 with x(i) in i..i+n and no value appearing more than 2 times.
A250353
Number of length 4 arrays x(i), i=1..4 with x(i) in i..i+n and no value appearing more than 2 times.
Terms
- a(0) =16a(1) =75a(2) =235a(3) =581a(4) =1221a(5) =2287a(6) =3935a(7) =6345a(8) =9721a(9) =14291a(10) =20307a(11) =28045a(12) =37805a(13) =49911a(14) =64711a(15) =82577a(16) =103905a(17) =129115a(18) =158651a(19) =192981a(20) =232597a(21) =278015a(22) =329775a(23) =388441a(24) =454601a(25) =528867a(26) =611875a(27) =704285a(28) =806781a(29) =920071
External references
- oeis: A250353